Bearing extraction device

ABSTRACT

A fixture for removing bearings from a rotary shaft in a machine or device without disassembling same, which consists of a pair of slidable mating members which form a cylindrical sleeve applied to the shaft adjacent to the bearing to be removed and applying a well known screw type wheel or gear-puller onto the fixture with the screw of the puller centered in the end of the shaft. Clockwise rotation of the screw will urge the fixture against the inner end of the bearing and withdraw the bearing from its support.

United States Patent 1191 Felser, Jr. Jan. 1, 1974 BEARING EXTRACTIONDEVICE [76] Inventor: Joseph Felser, Jr., 2208 Segori Cir., PnmaryExammer Thomas Eager Coral Gables, F121. 33134 Ammekuoyi Andres [21]Appl. No. 2 A fixture for removing bearings from a rotary shaft in amachine or device without disassembling same, 52 vs. 1. 29 201 whichconsists a Pair Shdabh mating members l5 ll 1111. ($1 B23p 1 9/04 whichmm a Cylindrical s'eeve applied the shaft [58] Field of Search 29/201200 D 200 R, jacem the hearing be hemmed and applying a 29/149 5 R wellknown screw type wheel or gear-puller onto the fixture with the screw ofthe puller centered in the end [56] References Cited of the shaft.Clockwise rotation of the screw will urge UNITED STATES PATENTS thefixture against the inner end of the bearing and withdraw the bearingfrom its support. 3,008,226 ll/l96l vKcllcrmun... 29/201 3,742,5707/1973 Fclscr. Jr. 29 201 4 Claims, 8 Drawing Figures BEARING EXTRACTIONDEVICE This invention relates in general to fixtures for the removal ofbearings without disassembly of the machine in which they are used.

Reference is had to applicants pending patent application, Ser. No.24l,786, US. Pat. No. 3,742,570.

Prior to this invention, bearings of the bushing, ball, or needle typeare usually fitted on the shaft and support for same in close tolerancestherewith, which usually require considerable force for removal forreplacement from working positions, which prior to this inventionusually required disassembly of the machine in which they are positionedand the use of an Arbor press, hand tools or hammer removal with the aidof a metal sleeve.

In many cases, the removal of a bearing is accomplished by the use ofthis invention through the use of a relatively low cost split fixtureand the application of a well known wheel or gear-puller for simpleextraction of the bearings by the wrench rotation of the screw in thewheel puller.

A principal object of the invention is the provision of a demountablefixture for positioning against the end of a bearing and the applicationthereto of a wheel puller for extracting the bushing without disassemblyof the machine in which it is used.

Another object of the invention is the provision of one or moreattachments to the fixture for proper engagement with shafts ofcorresponding sizes for the removal of bearings by the use of a simplegear or wheel puller to motivate the fixture.

These and other objects and advantages in one embodiment of theinvention are described and shown in the following specification anddrawing, in which:

FIG. 1 is a top plan view ofa typical bearing frictionally retained in asupport shown in cross section and fitted with a typical gear-pullerprior to extraction.

FIG. 2 is across sectional end view taken through section line 2-2, FIG.1.

FIG. 3 is a cross sectional view taken through section line 3-3, FIG. 1.

FIG. 4 illustrates the'extraction of the bearing elements shown in FIG.1.

FIG. 5 is an enlarged, perspective exploded view of the extractor shownin FIG. 1.

FIG. 6 is a perspective view of one of a pair of shaft reductionsleeves.

FIG. 7 is a top view in partial cross section showing two pair ofreduction sleeves secured in said extraction device by screws and wingnuts positioned to extract a bearing from a shaft of smaller diameter.

FIG. 8 is a cross sectional view taken through section line 8-8, FIG. 7.

Referring to FIG. 1, a fixed support member 1 supports a bearing 2 whichmay be a sleeve, ball bearing or roller type, fitted on a shaft 5 bymeans of an extractor assembly 4 and a standard well known gear-pullerassembly 5 which includes a pair of opposite hooks 6-6. In thisapplication half sleeves 7-7 are integral with telescopic body members 8and 9 respectively, which are adapted to extract bearing 2 from supportmember 1 and shaft 3.

FIG. 3. illustrates a pair of holes 10 and 11 through both half sleeves7-7 and showing slidable members 12-12 of the body member 8, shown inFIG. 2, slidably positioned in grooves 13-13 in body member 8.

FIG. 6 illustrates one form of sleeve attachment 14 for a shaft ofsmaller diameter and having a countersunk hole 15 therethrough, to behereinafter described. The sleeve attachment has a flange 16.at oneouter end having substantially the same diameter as the outside diameterof the bearing.

FIG. 7 illustrates the application of two pair of auxiliary sleeveattachments 14, which are retained on the inside of sleeves 7-7 byscrews 17-17 and wing nuts 18-18.

F IG. 7 also shows the parallel lateral V grooves 19-19 in members 8 and9 for receiving the ends of the hooks 6-6, respectively.

FIG. 5 illustrates the exploded view of the two major elements of theextractor prior to installation over the shaft for the extraction of abushing thereon, and also showing the slidable relation of members 12-12in member 8 in corresponding slots 20-20 in member 9.

It is to be noted that cylindrical pins may be substituted for therectangular members 12-12 in member 8 and corresponding holes may besubstituted for the slots 20-20 in member 9.

In operation, to remove a bearing from the end portion of a shaft andthe support, each half of the extractor sleeve is placed on oppositesides of the shaft on the inside of the support and by sliding members 8and 9 together and by fitting the hooks 6 of the gear-puller into thegrooves 19 with the point of the screw of the puller engaged in thecenter of the end of the shaft 3. Then the clockwise rotation of thescrew will force the extraction sleeves to be moved against the innerside of the bearing and force same outward from the support, asillustrated in FIG. 4.

It is now apparent that sleeves similar to those shown in FIG. 6 may beapplied to the outer side of each sleeve 7 to accommodate the extractionof bearings of larger diameter.

It is to be understood that certain modifications in constructionareintended to come within the teachings and scope of the abovespecification.

Having described my invention, I claim:

1. An extracting device for a cylindrical bearing fitted in a supportmeans and retaining the end portion of a rotary shaft,

a pair of like cylindrical first and second half sleeves ofpredetermined like length with the end bearing surfaces thereof in aplane normal to said sleeves when each of said sleeves are in matedrelation and with the inside cylindrical diameter substantially equal tothe diameter of said shaft and the outside cylindrical diametersubstantially equal to the diameter of said bearing,

a telescopic first projection means integral with and extending normalfrom the outer end portion of said first of said half sleeves,

a telescopic second slidable projection means extending normal from theouter end portion of said second of said sleeves and adapted to beengaged for manual sliding movement toward and into said firstprojection means for mating said sleeves together around said shaft withthe said end surfaces thereof positioned against the inner side of saidbearing,

a gear-puller having a pair of pivotal hooks and a central screw meanswhereby each said hook of said gear-puller is positioned around oppositesides of said support means and engaged with each opposite telescopicfirst and second projection means respectively and the end of said screwmeans engaged in the end of said shaft for manually forcing said bearingfrom said support means and said shaft when said screw means is manuallyrotated through a predetermined distance. r 2. The construction recitedin claim 1 wherein said first projection means has a pair of parallelstraight rectangular grooves extending along said projection means ateach side of said first half sleeve and said second projection meansincludes a pair of parallel straight rectangular guides normal to and onopposite sides of said second half sleeve for engaging and manuallysliding said guides in said grooves for guiding each of said sleevesinto mating relation.

3. The construction recited in claim 1 wherein said first projectionmeans includes a pair of parallel cylindrical pins extending intransverse relation from said projection means at each side of saidfirst half sleeve and said second projection means having a pair ofparallel holes in transverse relation with respect to said second halfsleeve whereby said pins will be manually engaged in said holes whensaid half sleeves are in mated relation on opposite sides of said shaft.

4. The construction recited in claim 1 including a pair of auxiliaryhalf sleeves with each one of predetermined uniform thickness and fittedto each said first and second half sleeves and retained therein by screwmeans with the outer ends of said auxiliary sleeves forming acylindrical flange mating the outside diameter of the bearing to beextracted.

1. An extracting device for a cylindrical bearing fitted in a supportmeans and retaining the end portion of a rotary shaft, a pair of likecylindrical first and second half sleeves of predetermined like lengthwith the end bearing surfaces thereof in a plane normal to said sleeveswhen each of said sleeves are in mated relation and with the insidecylindrical diameter substantially equal to the diameter of said shaftand the outside cylindrical diameter substantially equal to the diameterof said bearing, a telescopic first projection means integral with andextending normal from the outer end portion of said first of said halfsleeves, a telescopic second slidable projection means extending normalfrom the outer end portion of said second of said sleeves and adapted tobe engaged for manual sliding movement toward and into said firstprojection means for mating said sleeves together around said shaft withthe said end surfaces thereof positioned against the inner side of saidbearing, a gear-puller having a pair of pivotal hooks and a centralscrew means whereby each said hook of said gear-puller is positionedaround opposite sides of said support means and engaged with eachopposite telescopic first and second projection means respectively andthe end of said screw means engaged in the end of said shaft formanually forcing said bearing from said support means and said shaftwhen said screw means is manually rotated through a predetermineddistance.
 2. The construction recited in claim 1 wherein said firstprojection means has a pair of parallel straight rectangular groovesextending along said projection means at each side of said first halfsleeve and said second projection means includes a pair of parallelstraight rectangular guides normal to and on opposite sides of saidsecond half sleeve for engaging and manually sliding said guides in saidgrooves for guiding each of said sleeves into mating relation.
 3. Theconstruction recited in claim 1 wherein said first projection meansincludes a pair of parallel cylindrical pins extending in transverserelation from said projection means at each side of said first halfsleeve and said second projection means having a pair of parallel holesin transverse relation with respect to said second half sleeve wherebysaid pins will be manually engaged in said holes when said half sleevesare in mated relation on opposite sides of said shaft.
 4. Theconstruction recited in claim 1 including a pair of auxiliary halfsleeves with each one of predetermined uniform thickness and fitted toeach said first and second half sleeves and retained therein by screwmeans with the outer ends of said auxiliary sleeves forming acylindrical flange mating the outside diameter of the bearing to beextracted.